Graph showing GASC1 mRNA expression in tumors of different histological grades. Boxes represent the 25–75th percentile; whiskers: range; black line: median; black dots: outliers. The highest GASC1 mRNA expression is detected in tumors of grade I (GR I; 0.761±0.099). Tumors of grade II (GR II; 0.510±0.070) and III (GR III; 0.510±0.069) show lower GASC1 mRNA expression than tumors of grade I. There is no difference in GASC1 mRNA expression between tumors of grade II and III. Kruskal-Wallis test, p=0.02. Mann–Whitney test: grade I versus II - p=0.006; grade I versus III - p=0.019, grade II versus III - p=0.821.